Connected Correlators in Quantum Gravity

Details Connected Correlators in Quantum Gravity Connected Correlators in Quantum Gravity

1998-12-18

arxiv.org/abs/hep-lat/9812015v1

JHEP 9902 (1999) 005

Physics

High Energy Physics

High Energy Physics - Lattice

21 pages, 8 figures

Scientific paper

10.1088/1126-6708/1999/02/005

We discuss the concept of connected, reparameterization invariant matter correlators in quantum gravity. We analyze the effect of discretization in two solvable cases: branched polymers and two-dimensional simplicial gravity. In both cases the naively defined connected correlators for a fixed volume display an anomalous behavior, which could be interpreted as a long-range order. We suggest that this is in fact only a highly non-trivial finite-size effect and propose an improved definition of the connected correlator, which reduces the effect. Using this definition we illustrate the appearance of a long-range spin order in the Ising model on a two-dimensional random lattice in an external magnetic field $H$, when $H \to 0$ and $\beta=\beta_C$.

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